Suppressing Polysulfide Dissolution via Cohesive Forces by Interwoven Carbon Nanofibers for High-Areal-Capacity Lithium–Sulfur Batteries

Yun, Jong Hyuk; Kim, Do Kyung; Lee, Hyun‐Wook

doi:10.1021/acs.nanolett.7b04425

Cited by 141 publications

(88 citation statements)

References 52 publications

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“…The electrochemical impedance spectra (EIS) of the S/BGF electrode before cycling and after five cycles are shown in figure 6(a), where a single depressed semicircle in the high frequency region representing the charge transfer resistance (Rct). After cycling, the Rct of the S/BGF electrode shows an obvious decrease, indicating kinetically favored charge transfer kinetics at the electrode/electrolyte interface [24]. figure 6(d) shows the cyclic voltammetry (CV) profiles of the S/BGF electrode in the initial five cycles.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, conductive carbon materials with abundant and tunable pore structures have received a lot of attention, as they can not only alleviate the polysulfide dissolution issue and accommodate the volumetric changes of active materials by the porous framework, but they also promote the active material utilization due to their high conductivity [14]. Various sulfur/carbon composites with micro/meso/macroporous carbons [15][16][17][18], carbon nanotubes [19,20], graphene [21,22], carbon fibers [23,24] or carbon hybrids [25][26][27] have been developed for the promotion and stabilization of sulfur redox reactions. The chemical adsorption from the weak interactions between non-polar carbon materials and polar polysulfides arouses the concern of insufficient polysulfide-anchoring capability [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

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Binary graphene-based cathode structure for high-performance lithium-sulfur batteries

et al. 2020

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Lithium-sulfur (Li-S) batteries are highly appealing for the next-generation of energy storage because of their high energy density and low-cost features. However, the practical implementation of Li-S batteries has been hindered by fast performance degradation of the sulfur cathode, especially at a high cathode loading. Here, we propose a strategic design of binary graphene foam (BGF) as the cathode scaffold, with the incorporation of nitrogen-doped graphene and highly porous graphene. The nitrogen-doped graphene provides chemical adsorption sites for migrating polysulfides, and the highly porous graphene could increase the cathode conductivity and accelerate lithium ion transport. The freestanding foam-like cathode structure further offers a robust, interconnected, conductive framework to promote the redox reaction even at a high cathode loading. Therefore, the Li-S battery with the S/BGF electrode exhibits a high specific areal capacity over 10 mAh cm -2 and good cycling stability over 300 cycles. This approach offers insights into multifunctional electrode structure design, with targeted functions for high-performance Li-S batteries.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Binary graphene-based cathode structure for high-performance lithium-sulfur batteries

et al. 2020

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“…As shown in Figure 3a, the CNF/SÀCu/CNF film mainly included C, O, S, N and a small amount of Cu, originating from the PAN molecules (C, O and N), and the added S and Cu. [33] As shown in Figure 3d, The N 1s peaks in the XPS spectra of CNF/SÀCu/CNF sample are fitted into three peaks, which are pyridinic-N (at 397.4 eV), pyrrolic-N (at 399.6 eV) and quaternary-N (at 400.2 eV), respectively. This is because most of the Cu and S in the middle of the film cannot be captured by XPS.…”

Section: Structural and Morphological Featuresmentioning

confidence: 91%

“…Furthermore, it is also worth noting that the high N-doping will help to prevent the shuttle reaction of polysulfide. [33] As shown in Figure 3d, The N 1s peaks in the XPS spectra of CNF/SÀCu/CNF sample are fitted into three peaks, which are pyridinic-N (at 397.4 eV), pyrrolic-N (at 399.6 eV) and quaternary-N (at 400.2 eV), respectively. [27,[34][35][36] A high ratio of pyridinic-N (41.3 % at.…”

Section: Structural and Morphological Featuresmentioning

confidence: 91%

Hierarchically Designed CNF/S−Cu/CNF Nonwoven Electrode as Free‐Standing Cathode for Lithium−Sulfur Batteries

Bian

Yuan

et al. 2019

Batteries & Supercaps

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A flexible lithiumÀsulfur (LiÀS) battery cathode is prepared through uniformly depositing sulfur solution into an electrospun N-rich and Cu-decorated nonwoven carbon nanofiber (CNF) film to form sandwich structured CNF/SÀCu/CNF film electrodes. As a free-standing cathode of LiÀS battery, the unique structural CNF/SÀCu/CNF composite cathodes exhibit high capacity and rate capability as well as long cycling stability. The electrodes can deliver a reversible capacity of 1295 mAh g À1 at a current density of 0.1 A g À1 , and maintain more than 530 mAh g À1 even at a high current rate of 1 A g À1 after 300 cycles along with a Coulombic efficiency close to 100 %. The exceptional performance of CNF/SÀCu/CNF as cathode in LiÀS batteries is attributed to a synergistic contribution from the CNF layers, the decorated-Cu nanoparticles and the doped N element in CNF, which can physically and chemically stabilize S and provide fast electronic conductivity. This facile strategy will pave the way to construct high-performance flexible LiÀS batteries.

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“…But the S vapor process resulted in inferior bond between S and CNFs. Yun et al have demonstrated that electrospun CNFs achieved excellent performance in Li‐S batteries in Figure a, which offered great electrical conductivity, resulting in low interfacial impedance. The electrospun CNFs immersed in a mixture of the sublimed S powder and N‐methyl‐2‐pyrrolidone, and the S were smoothly adhered to the nanofibers.…”

Section: Cathodementioning

confidence: 99%

A Review: Electrospun Nanofiber Materials for Lithium‐Sulfur Batteries

Liu

Deng

et al. 2019

Adv Funct Materials

165

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Lithium-sulfur (Li-S) batteries are in the spotlight because their outstanding theoretical specific energy is much higher than those of the commercial lithium ion (Li-ion) batteries. Li-S batteries are tough competitors for futuredeveloping energy storage in the fields of portable electronics and electric vehicles. However, the severe "shuttle effect" of the polysulfides and the serious damage of lithium dendrites are main factors blocking commercial production of Li-S batteries. Owing to their superior nanostructure, electrospun nanofiber materials commonly show some unique characteristics that can simultaneously resolve these issues. So far, various novel cathodes, separators, and interlayers of electrospun nanofiber materials which are applied to resolve these challenges are researched. This review presents the fundamental research and technological development of multifarious electrospun nanofiber materials for Li-S cells, including their processing methods, structures, morphology engineering, and electrochemical performance. Not only does the review article contain a summary of electrospun nanofiber materials in Li-S batteries but also a proposal for designing electrospun nanofiber materials for Li-S cells. These systematic discussions and proposed directions can enlighten thoughts and offer ways in the reasonable design of electrospun nanofiber materials for excellent Li-S batteries in the near future.or conducting coagulation bath) is placed against the capillary. A thin polymer fiber membrane is deposited on the collector. The electrospun nanofibers have big potential for developing the outstanding energy storage systems due to their high surface area and excellent surface-to-volume ratio which can offer numerous active sites and controllable porous structure to buffer the huge volume changes during battery cycling and infiltrate the electrolyte. [18] Electrospun nanofiber membranes possess high porosity, large specific surface area, and controllable pore size, which will block "shuttle effect" of polysulfides and enhance the wettability for electrolytes. [19] Electrospinning technique and carbonization process are facile to manufacture freestanding nanofiber fabrics with controllable porous architecture and outstanding electrical conductivity. Electrospun porous nanofibers can come into a reservoir-like matrix for the reserve of active materials. First, the hierarchical pores in electrospun porous nanofibers can improve the reactive S reaction sites and block soluble polysulfides, thereby decreasing the "shuttling effect" of polysulfides during the electrochemical cycling. Second, electrospun porous fibers have excellent physical and mechanical properties, outstanding architecture, and superior electrical conductivity, which can enhance the transfer of Li-ions and electrons, endowing extraordinary electrochemical performance of the whole battery system. [20] Figure 2 shows phase and morphological evolutions of the electrospun nanofibers. By combining the electrospinning and other treatment (thermal, chem...

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Suppressing Polysulfide Dissolution via Cohesive Forces by Interwoven Carbon Nanofibers for High-Areal-Capacity Lithium–Sulfur Batteries

Cited by 141 publications

References 52 publications

Binary graphene-based cathode structure for high-performance lithium-sulfur batteries

Binary graphene-based cathode structure for high-performance lithium-sulfur batteries

Hierarchically Designed CNF/S−Cu/CNF Nonwoven Electrode as Free‐Standing Cathode for Lithium−Sulfur Batteries

A Review: Electrospun Nanofiber Materials for Lithium‐Sulfur Batteries

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